Abrading-cylinder



3 S E B R 0 n D L ABRADING CYLINDER.

No. 425,376. PgtentedApr. 8, 1890.

71 TWESSES (No Model.) I 3 Sheets-Sheet 2. L. D. FORBES.

ABRADING CYLINDER.

No. 425,376. PatentedApr. 8, 1890.

% M7 flviim (No Model.) 3 Sheets-Sheet 3.

L.. D. FORBES. ABRADING CYLINDER. .No. 425.376. Patented Apr. 8. 1890.

WZTWE'SSES mmwoze ure.

UNITED STATES PATENT OFFICE.

LOUIS D. FORBES, OF BERLIN, ASSIGNOR TO THE BERLIN MACHINE XVORKS,

OF BELOIT, \VISOONSIN.

ABRADlNG-CYLINDER.

SPECIFICATION forming part of Letters Patent No. 425,376 dated April 8,1890.

Serial No. 320,180. (No model.)

To aZZ whom it 12mg concern:

Be it known that I LOUIS D. FORBES, of Berlin, in the county of GreenLake and State of \Visconsin, have invented a new and useful Improvementin Abrading-Cylinders, of which the following is a specification.

In the annexed drawings, making a part of this specification, Figure 1is a perspective View of a section of the paper-cylinder. Fig. 2 is anend elevation of the same section. Fig. 3 is an elevation of thecylinder broken away to show a central section of part thereof; Fig. 4,a similar elevation and section, but on a different plane, so that theheads do not hide the stems attached to the clamping-bar. Fig. 5 is aside elevation of the clamping-bar and stems. Fig. 6 is an end elevationof the same; and Fig. 7 is a perspective view of a section of thecylinder, showing a variation in the construction of parts.

The same letters are employed in all thefigures in the indication ofidentical parts.

My invention relates especially to a combination of parts connected withthe sand-cylinder of a machine for polishing wood or other surfaces, bymeans of which the sheet of sandpaper or its equivalent covering thecylinder is attached thereto.

The cylinder Ais the usual and well-known cylinder to which thesand-paper is attached. The paper is in large sheets and out so as tofit the entire periphery of the working part of the cylinder which itencircles, the two ends being received in a longitudinal recess A Theheads of the cylinder are shown at A. In the case illustrated there isone at each end and one in the middle.

In the bottom of the recess A is placed a cushion O, which may be astrip of elastic material, preferably an india-rubber or leather strip.A solid piece of an elastic substance may be used, the important featurebeing that it shall be a substance which will form a cushion capable ofindentation under pressure and with sufficient elasticity to resume itsoriginal shape when relieved of the press- This cushion, it will beobserved, is an independent piece of elastic material and not a part ofthe thin cushion which surrounds the cylinder under the sand-paper,which is generally secured by nails driven into a piece of wood formingthe bottom of the recess, and

is too thin to have the amount of compressibility and elasticityrequired for such a cushion as I desire to use.

Above the cushion is an adjustable clamping-barD, which is capable ofbeing forced down by suitable mechanism to press upon the two ends ofthe sheet of sand-paper or its equivalent and confine them between theadj ustable clamp and the cushion. This is, preferably, asemi-cylindrical bar carried upon stems D, each with a slot D out, asshown, and passing down through holes in the bottom of the recess. Theclamp is actuated by means of a reciprocating slide E, which is a metalbar sliding in metallic ways E in the heads, which confine it in placeand sustain the upward pressure, the lower edge being restrained by thebottom of the slot formed in bosses G on the exterior or interiorsurface of the heads.

The reciprocating slide E (shown'in Fig. 1) has a portion cut away, asshown at E, so as to form wedge-shaped hooks E, which, entering theslots D in the stems D, bear by their lower faces against thelower endsof the slots D which slots are preferably beveled at the bottom toconform to the lower edge of the wedges, so that as the slide is drawnto the right from the position shown in Fig. 1 the wedges E entering theslots D will cause the stems D and the clamping-bar D to be drawn down,and so confine the two ends of the sandpaper. When the slide is moved inthe opposite direction, thelower surfaces of the cutaway portion E bearagainst the lower end of the stems and lift the clamping-bar. In thedrawings only one of the hooks is shown.

It must be understood that the slide is simio larly constructed wheneverit is intended to act upon a stem, three being shown in the drawings;but more or less may be used. This reciprocating slide E is actuated bya rod F, screw-threaded at F, which rotates in suit- 5 able bearings inthe heads A, and is turned by a socket-wrench on the squared ends F, orin other convenient manner. The screwthreaded portion of this rod passesthrough a lug or bracket Eflattached to the slide E, which has a holeformed with-a female screw to receive it. By turning the rod F thereciprocating slide E will be moved in one direction to draw down theclamping-bar D upon the ends of the paper and be moved in the other toraise the clamping-bar and release the ends of the paper.

The reciprocating slide shown in Fig. 7 is another and equivalentconstruction. In that instance the reciprocating slide E has twotriangular notches cut out of its upper and lower edges, having aninclined neck E, which passes through the lower end of the slot D and asthe reciprocating slide is drawn to the right, as before, theclampingbar D is drawn down. When the slide is moved in the oppositedirection, the upper surface of the neck E bearing against a pin Dpassing through stem D and across the slot D lifts the stem andclamping-bar. As the slot D must be long enough .to re ceive the fullwidth of the slide E, in order to permit the slide to be put in place inconstructing the cylinder, when it has thus been put in place the pin Dis inserted. This slot D need not be so long when the wedges shown inFig.1 are used, because in such case in constructing the cylinder theclamping-bar and its stems may be put in place after the slide E is inplace, as then the lower ends of the stems are received in the upperends'of the out-away portion E, Fig. 1.

It is difficult with the cylinder heretofore in use, to put thesand-paper on so as to have it perfectly uniform upon the cylinder. Inthis case, however, as the pressure comes upon the paper gradually byreason of the gradual compression of the cushion O, the

paper will be drawn endwise, in case there is an' inequality of strainupon it, until the strain is equalized along the entire width, and then,when the clamping-bar is drawn down to its bearings, itwill hold itfirmly and with an equal strain on all parts, so it will be in contactwith the cylinder closely upon the whole of its periphery.

to, and cushion, the adjustable slide with in-.

clined surfaces which act against the, stems and gradually close theclamping-bar upon the paper confined between it and the cushion,substantially as set forth.

I. In combination with the adjustable clamping-bar and stems, the slideformed with inclined surfaces which act upon the stems and the screw-threaded rod which gives movement in either direction to the slide,substantially set forth.

5. Thecombinationof theadjustableclampin g-bar and slotted stemsattached thereto, the reciprocating slide E, constructed with wedgeformed hooks which enter the slots and draw down the clamping-bars,substantially as set forth.

6. In combination with the adjustable clamping-bar and stems attachedthereto, the reciprocating slide E, constructed with an inclined surfacewhich lifts the stems and clamping-bar when the slide is moved to raisethe latter, substantially as set forth.

In testimony whereof I have hereunto attached my signature, this 27thday of July, A. D. 1889, in presence of two subscribing witnesses.

LOUIS D. FORBES.

In presence of R. MASON, K. KOEHRIG.

